Delete unused method for getting push client.

Depends on https://crrev.com/687933002/

BUG=304341,350378

Review URL: https://codereview.chromium.org/646653005

Cr-Commit-Position: refs/heads/master@{#304016}

content/renderer/render_view_impl.cc

@@ -3964,12 +3964,6 @@ blink::WebPageVisibilityState RenderViewImpl::visibilityState() const {
   return current_state;
 }
 
-blink::WebPushClient* RenderViewImpl::webPushClient() {
-  // TODO(mvanouwerkerk): Remove this method once the Push API code in Blink
-  // has also switched over to Frame.
-  return main_render_frame_->pushClient();
-}
-
 void RenderViewImpl::draggableRegionsChanged() {
   FOR_EACH_OBSERVER(
       RenderViewObserver,

content/renderer/render_view_impl.h

@@ -431,7 +431,6 @@ class CONTENT_EXPORT RenderViewImpl
   virtual void unregisterProtocolHandler(const blink::WebString& scheme,
                                          const blink::WebURL& url);
   virtual blink::WebPageVisibilityState visibilityState() const;
-  virtual blink::WebPushClient* webPushClient();
   virtual void draggableRegionsChanged();
 
 #if defined(OS_ANDROID)

content/shell/renderer/test_runner/web_test_proxy.h

@@ -399,9 +399,6 @@ class WebTestProxy : public Base, public WebTestProxyBase {
   virtual blink::WebString acceptLanguages() {
     return WebTestProxyBase::acceptLanguages();
   }
-  virtual blink::WebPushClient* webPushClient() {
-    return WebTestProxyBase::GetWebPushClient();
-  }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebTestProxy);